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Pre-Production Costs Related to Long-Term Supply Agreements (Tables)
6 Months Ended
Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Classification of Recoverable Customer Engineering, Development and Tooling Costs Related to Long-term Supply Agreements
The classification of recoverable customer E&D and tooling costs related to long-term supply agreements is shown below (in millions):
 
June 30,
2018
 
December 31, 2017
Current
$
229.9

 
$
248.1

Long-term
75.0

 
59.3

Recoverable customer E&D and tooling
$
304.9

 
$
307.4